Hahaha you're totally not lame! Shotgunning is basically when you blow/suck smoke into or out of someone else's mouth. Like, you take a drag of a cigarette or a hit of some kind of smoked drug and you pass it to someone else by kissing them.

Lol my headcanon is that human!Cas is a vegetarian and a very picky eater, because of the whole Famine incident, and food is kind of hard to come by in 2014, so I tend to draw him a little smaller than I normally would in that verse.

/thinks way too much about these things

...Poor Cas is right though, he's so pitiful in that verse, I love him so... </3